A kind of in-situ test method and in-situ test structure of deep soft rock tunnel
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A technology of in-situ testing and tunneling, which is applied in earth cube drilling, mining equipment, mining equipment, etc., can solve the problems of high cost, low strength, damage, etc., to improve depth and reliability, save construction time, and reduce construction cost. effect of difficulty
Active Publication Date: 2016-03-09
POWERCHINA HUADONG ENG COPORATION LTD
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[0003] At present, domestic and foreign research on soft rock tunnel engineering with high buried depth and large cross-section is still mainly focused on laboratory tests. However, due to the obvious anisotropy characteristics of soft rock and its low strength, the sampling and sample preparation process It is easy to be damaged by the influence of the external environment, so the actual response characteristics of soft rock in the field are very different from those in laboratory tests. It is necessary to carry out in-situ tests to grasp the deformation of surrounding rock in deep soft rock tunnels However, excavating a simulated test tunnel with the same size as the original tunnel is not only expensive, but also difficult to meet the time requirements of the project. If the size is small, the surrounding rock failure phenomenon under high stress conditions cannot be fully exposed. , unable to strongly support the research on the problem of soft rock cavitation
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Embodiment 1
[0034] Embodiment 1, the in-situ testing method of the deep soft rock tunnel.
[0035] Refer to attached Figure 1-7 .
[0036] The in-situ testing method of deep buried soft rock tunnel of the present invention comprises the following steps:
[0037] S1. Sampling the previous cavern 1, conducting indoor rock mechanics tests, and conducting in-situ stress tests to obtain the distribution characteristics of the in-situ stress field and provide basic data for subsequent analysis.
[0038] S2, calculate and determine the parameters of the simulation test hole 2, the parameters include buried depth, axis direction, hole diameter D, section shape and hole length H.
[0039] As mentioned in the background technology, excavating a simulated test tunnel with the same size as the original tunnel is not only expensive, but also difficult to meet the time requirements of the project, and if the size is too small, the surrounding rock failure phenomenon under high stress conditions cann...
Embodiment 2
[0062] Example 2, in situ test structure.
[0063] Refer to attached Figure 7-8 .
[0064] The in-situ test structure of the present invention can be excavated according to the in-situ test method in Example 1. The in-situ test structure includes a simulation test hole 2, a preliminary exploration hole 1 and an observation branch hole 5.
[0065] The simulated test hole 2 is arranged behind the preliminary exploration hole 1 of the soft rock tunnel. The parameters of the simulated test hole 2, such as buried depth, axis direction, hole diameter, cross-sectional shape and hole length, can be pre-calculated by the in-situ test method in Example 1. get.
[0066] The axial direction of the simulated test hole 2 is perpendicular to the maximum principal stress direction of the deeply buried soft rock. Generally, in order to ensure the stability of the surrounding rock in deep buried tunnels, the tunnel axis should be selected as consistent as possible with the maximum principal...
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Abstract
The invention provides an in-situ test method for a deeply-buried soft-rock tunnel. The in-situ test method comprises the first step of conducting sampling on an early-stage exploration tunnel to obtain distribution characteristics of in-situ stress fields, the second step of calculating and determining parameters of a simulation test tunnel, the third step of excavating and expanding a size effect transition section, the fourth step of calculating and determining positions of monitoring sections, the fifth step of arranging an observation branch tunnel and pre-burying monitoring instruments, the sixth step of excavating the simulation test tunnel, and the seventh step of conducting regular observation through the monitoring instruments. The invention further provides an in-situ test structure for the deeply-buried soft-rock tunnel. The in-situ test structure for the deeply-buried soft-rock tunnel is established according to the in-situ test method. The in-situ test structure comprises the simulation test tunnel, the early-stage exploration tunnel and the observation branch tunnel. By the adoption of the in-situ test method and structure, anisotropism and size effects of soft rock are truly represented, a large quantity of measured data and test information of the properties of surrounding rock can be obtained, the uncertain factors that deeply-buried soft rock are low in strength and prone to softening with water, and a high deeply-buried cave section is hard to form are avoided, the defects of existing monitoring methods and tests are effectively overcome, and a reliable data support is provided for analysis of stability of the tunnel.
Description
technical field [0001] The invention relates to a testing technology for deep-buried soft rock tunnels, in particular to an in-situ testing technology for the size effect and anisotropy characteristics of deep-buried soft rock tunnels. Background technique [0002] At present, the tunnel engineering has been developed in the direction of growing and deep burial. More and more tunnel projects in all walks of life have experienced continuous large deformation and landslides in local tunnel sections due to reasons such as high ground stress, weak surrounding rock, and developed joints and fissures due to deep burial. In particular, hydraulic and traffic tunnel projects generally have large excavation sections, and the section size effect makes the above phenomenon more obvious, causing great difficulties to tunnel design and construction. Once the high ground stress is combined with the weak surrounding rock, the rock around the cave will be subjected to high ground stress aft...
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